I'm stumped. I cannot get the HTML I wrote to display! I followed all the steps properly with creating a webarchive file, renaming so that it shows up in Apple Mail. But then when I go back in and see the signature, it's there but it doesn't display the HTML ... it just displays the code!

I've tested the HTML code on a webpage, and it works just fine. I have my message format as Rich Text.

I followed all those steps exactly. This is what I see when I look at the .webarchive file I made: files.me.com/azdesertfather/yutxdw I made it in TextEdit and saved as .webarchive, but I also tried doing it in Word as an .html then bringing that into Safari to make it a .webarchive. Both ways, same weird problem...
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user3539Feb 12 '11 at 0:24

When I was typing out the file in TextEdit, I needed to use the setting Format > Make Plain Text (or use a pure text editor like Text Wrangler). That was messing up the whole process. Now it's working!